The Battlefield 1 Community Test Environment for Xbox One and PS4
To get the CTE on the Xbox One, from the main menu, go to MORE. You’ll see Community Test Environment as an option. Agree to the terms and conditions and install.
The initial rollout will be gated, so if you have issues getting in immediately, don’t worry there will be more slots over time.
You’ll also need Battlefield 1 and Battlefield 1 Premium Pass to access the CTE.
The Battlefield 1 Community Test Environment is a dev-driven initiative to further enhance Battlefield 1, add/test features, and bring the community closer to the development of the game.
— Battlefield V (@Battlefield) January 30, 2017